Liquid cooling unit for an internal combustion engine

A removable cooling unit for mounting on the housing of an internal combustion engine, the housing having a first interior portion provided with an external inlet and an external outlet and through which a first liquid circulates and a second interior portion through which a second liquid circulates, the second interior portion being provided with a relatively large access opening, said unit comprising a removable base section for overlying the access opening and being sealingly secured to surface portions circumjacent the access opening, said base section being provided with a first set of ports adapted to register with the inlet and outlet of the first interior portion and a second set of ports spaced from said first ports;

• a heat exchange section carried on one side of said base section and protruding therefrom, said heat exchange section and said base section being of unitary construction and said heat exchange section being adapted to project through the access opening into the second interior portion whereby the exterior of said heat exchange section is positioned independently of the housing surfaces defining said access and is contacted only by the circulating second liquid, the interior of said heat exchange section being in communication with said second set of ports, the first liquid being adapted to circulate through the interior of said heat exchange section;
• and a cover section sealingly secured to a second side of said base section, said cover section having the surface thereof adjacent said base section concealed and provided with a plurality of independent passages, a first of said passages interconnecting a port of the first set with a port of the second set and a second of said passages interconnecting another port of the first set with another port of the second set.